Howell 2006.

Methods	RCT by remote telephone system
Participants	Biliary strictures due to unresectable malignancy occurring at least 2cm below the bifurcation
Interventions	6mm nitinol SEMS, OR 10mm nitinol SEMS, OR 10mm uncoated Wallstent
Outcomes	Placement success, Malpositioning, Post‐placement complication, Stent patency, Number of ERCPs, Mortality
Notes	N=183 Abstract
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Unclear risk	Not described
Allocation concealment?	Low risk	Remote telephone
Blinding? All outcomes	High risk
Incomplete outcome data addressed? All outcomes	High risk	All follow‐up not reported
Free of selective reporting?	High risk	Not all outcomes reported in abstract
Free of other bias?	Unclear risk	Abstract only